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Chemistry

Chemistry
Which is the purest form of iron?

Wrought iron
Cast iron
Steel
Pig iron

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Chemistry
The gas which turns into liquid at the lowest temperature among the following is

Hydrogen
Oxygen
Nitrogen
Helium

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Chemistry
The buffer action of blood is due to the presence of

[HCO3]– and H2CO3
HCI and NaCI
CI– and [CO3]2–
CI– and [HCO3]–

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Chemistry
Which one of the following contains maximum percentage of carbon ?

Stainless steel
High speed steel
Cast iron
Wrought iron

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Chemistry
The purest form of water is

Rain water
Ground water
Distilled water
Tap water

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Chemistry
If the equilibrium constants for the systems H2 + I2 ? 2HI and 2HI ? H2 + I2 are K1 and K2 respectively, the relationship between K1 and K2 is :

K1 = K2
K 1 = 1 /K2
K1 = K2/2
K1 = 2K2

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